Abstract
In this paper, we present room temperature unpolarized Raman scattering spectra of Ni doped PbTe single crystal sample. Crystal of PbTe(Ni) was grown by the Bridgman method. The Ni concentration in the sample used here was 1 × 10 at./cm. Well resolved peaks appear at about 126, 143, 181, 362 and 724 cm−1. The modes at 126 and 143 cm−1, which are also observed in other telluride compounds, originate from vibrations in TeO2. We assume that the mode at about 181 cm −1 is connected to excitations of a local phonon mode in the vicinity of an impurity atom (donor Ni state). Modes at about 362 cm−1 and 724 cm−1 are the second and fourth harmonic of a local phonon mode, registered here due to multiphonon emission.
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